CN114180774A - Waste acid regeneration and resource recovery system - Google Patents
Waste acid regeneration and resource recovery system Download PDFInfo
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- CN114180774A CN114180774A CN202111480084.XA CN202111480084A CN114180774A CN 114180774 A CN114180774 A CN 114180774A CN 202111480084 A CN202111480084 A CN 202111480084A CN 114180774 A CN114180774 A CN 114180774A
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- 239000002253 acid Substances 0.000 title claims abstract description 183
- 239000002699 waste material Substances 0.000 title claims abstract description 132
- 238000011084 recovery Methods 0.000 title claims abstract description 95
- 230000008929 regeneration Effects 0.000 title claims abstract description 22
- 238000011069 regeneration method Methods 0.000 title claims abstract description 22
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 229
- 239000007788 liquid Substances 0.000 claims abstract description 98
- 238000009833 condensation Methods 0.000 claims abstract description 72
- 230000005494 condensation Effects 0.000 claims abstract description 72
- 238000007710 freezing Methods 0.000 claims abstract description 46
- 230000008014 freezing Effects 0.000 claims abstract description 46
- 238000002425 crystallisation Methods 0.000 claims abstract description 21
- 230000008025 crystallization Effects 0.000 claims abstract description 21
- 239000002918 waste heat Substances 0.000 claims abstract description 10
- 238000004064 recycling Methods 0.000 claims abstract description 9
- 238000000926 separation method Methods 0.000 claims abstract description 8
- 238000001914 filtration Methods 0.000 claims abstract description 7
- 239000000498 cooling water Substances 0.000 claims description 115
- 238000001704 evaporation Methods 0.000 claims description 37
- 230000008020 evaporation Effects 0.000 claims description 37
- 230000017525 heat dissipation Effects 0.000 claims description 36
- 238000003756 stirring Methods 0.000 claims description 14
- 239000012530 fluid Substances 0.000 claims description 12
- 239000013078 crystal Substances 0.000 claims description 10
- 238000000034 method Methods 0.000 claims description 9
- 238000010438 heat treatment Methods 0.000 claims description 7
- 239000008247 solid mixture Substances 0.000 claims description 6
- 230000001502 supplementing effect Effects 0.000 claims description 6
- 238000001816 cooling Methods 0.000 claims description 5
- 229920006395 saturated elastomer Polymers 0.000 claims description 5
- 239000012153 distilled water Substances 0.000 claims description 3
- 238000005485 electric heating Methods 0.000 claims description 3
- 239000007787 solid Substances 0.000 claims description 3
- 238000004519 manufacturing process Methods 0.000 abstract description 9
- 230000000694 effects Effects 0.000 abstract description 5
- 238000010306 acid treatment Methods 0.000 abstract description 3
- 230000001172 regenerating effect Effects 0.000 abstract description 3
- 239000000463 material Substances 0.000 description 8
- 238000005554 pickling Methods 0.000 description 7
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 6
- 229910000831 Steel Inorganic materials 0.000 description 5
- 239000010959 steel Substances 0.000 description 5
- 238000005260 corrosion Methods 0.000 description 4
- 230000007797 corrosion Effects 0.000 description 4
- 239000003814 drug Substances 0.000 description 4
- 239000000126 substance Substances 0.000 description 4
- 230000007613 environmental effect Effects 0.000 description 3
- 239000002360 explosive Substances 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 2
- GRWVQDDAKZFPFI-UHFFFAOYSA-H chromium(III) sulfate Chemical compound [Cr+3].[Cr+3].[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O GRWVQDDAKZFPFI-UHFFFAOYSA-H 0.000 description 2
- 238000004140 cleaning Methods 0.000 description 2
- 238000004134 energy conservation Methods 0.000 description 2
- 235000003891 ferrous sulphate Nutrition 0.000 description 2
- 239000011790 ferrous sulphate Substances 0.000 description 2
- 229920002313 fluoropolymer Polymers 0.000 description 2
- 229910002804 graphite Inorganic materials 0.000 description 2
- 239000010439 graphite Substances 0.000 description 2
- 238000009776 industrial production Methods 0.000 description 2
- BAUYGSIQEAFULO-UHFFFAOYSA-L iron(2+) sulfate (anhydrous) Chemical compound [Fe+2].[O-]S([O-])(=O)=O BAUYGSIQEAFULO-UHFFFAOYSA-L 0.000 description 2
- 229910000359 iron(II) sulfate Inorganic materials 0.000 description 2
- 230000001590 oxidative effect Effects 0.000 description 2
- 238000001556 precipitation Methods 0.000 description 2
- 229910001220 stainless steel Inorganic materials 0.000 description 2
- 239000010935 stainless steel Substances 0.000 description 2
- 239000002351 wastewater Substances 0.000 description 2
- 229910000885 Dual-phase steel Inorganic materials 0.000 description 1
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 229960002089 ferrous chloride Drugs 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 229910000856 hastalloy Inorganic materials 0.000 description 1
- 239000002920 hazardous waste Substances 0.000 description 1
- DKAGJZJALZXOOV-UHFFFAOYSA-N hydrate;hydrochloride Chemical compound O.Cl DKAGJZJALZXOOV-UHFFFAOYSA-N 0.000 description 1
- NMCUIPGRVMDVDB-UHFFFAOYSA-L iron dichloride Chemical compound Cl[Fe]Cl NMCUIPGRVMDVDB-UHFFFAOYSA-L 0.000 description 1
- 239000010812 mixed waste Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000012452 mother liquor Substances 0.000 description 1
- 238000006386 neutralization reaction Methods 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 239000006228 supernatant Substances 0.000 description 1
- 239000013589 supplement Substances 0.000 description 1
- 239000010936 titanium Substances 0.000 description 1
- 229910052719 titanium Inorganic materials 0.000 description 1
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Classifications
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/02—Treatment of water, waste water, or sewage by heating
- C02F1/04—Treatment of water, waste water, or sewage by heating by distillation or evaporation
- C02F1/048—Purification of waste water by evaporation
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/02—Treatment of water, waste water, or sewage by heating
- C02F1/04—Treatment of water, waste water, or sewage by heating by distillation or evaporation
- C02F1/043—Details
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/22—Treatment of water, waste water, or sewage by freezing
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F9/00—Multistage treatment of water, waste water or sewage
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23G—CLEANING OR DE-GREASING OF METALLIC MATERIAL BY CHEMICAL METHODS OTHER THAN ELECTROLYSIS
- C23G1/00—Cleaning or pickling metallic material with solutions or molten salts
- C23G1/36—Regeneration of waste pickling liquors
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/16—Nature of the water, waste water, sewage or sludge to be treated from metallurgical processes, i.e. from the production, refining or treatment of metals, e.g. galvanic wastes
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
- Y02B30/52—Heat recovery pumps, i.e. heat pump based systems or units able to transfer the thermal energy from one area of the premises or part of the facilities to a different one, improving the overall efficiency
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Organic Chemistry (AREA)
- Hydrology & Water Resources (AREA)
- Life Sciences & Earth Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- General Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Heat Treatment Of Water, Waste Water Or Sewage (AREA)
Abstract
The invention discloses a constant-pressure low-temperature air circulation continuous waste acid regeneration and recovery system, which comprises an air circulation system, a heat pump system, a condensation recovery system and a freezing crystallization system; the water molecules and volatile acid in the low-temperature air separation waste acid liquid of the air circulation system are utilized, primary condensation recovery is carried out through the condensation recovery system, meanwhile, the waste heat of the condensation recovery system recovered by the heat pump system is continuously utilized to provide heat for the air circulation system, the concentrated acid liquid treated by the air circulation system is introduced into the freezing crystallization system for freezing crystallization and filtration, and the residual liquid is finally stored in the recovery tank for recycling. The system is suitable for treating waste acid solution with any concentration, and the waste acid treatment cost is greatly reduced due to the low manufacturing cost of equipment required by the normal-pressure low-temperature operation environment and the recycling operation of waste heat. The effect of regenerating acid is good.
Description
Technical Field
The invention relates to the technical field related to waste acid regeneration and resource recovery, in particular to a waste acid regeneration and resource recovery system.
Background
The acid pickling treatment of the steel is used for removing the iron oxide scales on the surface of the cold-rolled plate blank, namely the hot-rolled plate. The invention of application No. CN201910465444.5 discloses a waste acid recovery method for treating steel pickling waste liquid, which is used for treating the pickling waste liquid obtained by cleaning steel by hydrochloric acid, and utilizes a method of introducing HCl gas into the pickling waste liquid and simultaneously adding water or dilute hydrochloric acid into the pickling waste liquid to separate ferrous chloride tetrahydrate crystals from the pickling waste liquid, and the recovered supernatant is the hydrochloric acid solution which can be reused for cleaning steel. At present, the waste acid generated in the steel pickling process in the field has two treatment modes: firstly, the waste is transferred to a qualified third party for treatment as hazardous waste, and secondly, evaporation equipment is adopted for evaporation; if the waste acid is transferred to a third party, the problem is that the waste acid leakage may cause environmental risks, and in addition, the transfer cost is up to thousands of yuan per ton, so that relatively large cost pressure is caused to enterprises; if the traditional evaporation equipment is adopted for evaporation treatment, the equipment investment is large (for the materials 2205 dual-phase steel, hastelloy and the like of the equipment), and the operation cost is high; or a large amount of alkali is added for neutralization, and then 316L or titanium materials are adopted as evaporation equipment; in addition, the traditional evaporation process also has mother liquor, which increases the difficulty of subsequent treatment.
Disclosure of Invention
Therefore, in order to solve the above-mentioned disadvantages, the present invention provides a waste acid regeneration and recycling system. Waste acid recovery, mixed waste acid recovery, explosive product concentration and the like. The system is suitable for treating waste acid solution with any concentration, and the waste acid treatment cost is greatly reduced due to the low manufacturing cost of equipment required by the normal-pressure low-temperature operation environment and the recycling operation of waste heat. The effect of regenerating acid is good.
The invention is realized by constructing a waste acid regeneration and resource recovery system; the system comprises four parts, namely an air circulation system, a heat pump system, a condensation recovery system and a freezing crystallization system; the water molecules and volatile acid in the waste acid liquid are separated by utilizing the low-temperature air of the air circulation system, the condensation recovery system is used for carrying out primary condensation recovery, meanwhile, the heat pump system is used for recovering the waste heat of the condensation recovery system to continuously provide heat for the air circulation system, the concentrated acid liquid treated by the air circulation system is introduced into the freezing crystallization system for freezing crystallization and filtration, and the residual liquid is finally stored in the recovery tank for recycling.
As an improvement of the above technical solution; the waste acid regeneration and resource recovery system; the air circulation system relates to an evaporator, a fan, a water pump, a plate type heat exchange device and a supplementing device;
the evaporator is provided with a supplementary waste acid liquid inlet, an air input end, an air output end, a waste acid liquid input end, a waste acid liquid output end and a concentrated waste acid liquid output end, and the evaporator is used for heating air to evaporate and separate water molecules and volatile acid liquid in waste acid;
the fan is provided with an air input end and an air output end and is used for providing power for air circulation;
the water pump is provided with a waste acid liquid input end and a waste acid liquid output end and is used for providing power for waste acid liquid circulation;
the plate type heat exchange device is provided with a waste acid liquid input end, a waste acid liquid output end, a hot water input end and a hot water output end, and the plate type heat exchange device is used for heating the waste acid liquid;
the replenishing device is an external device and is used for providing the waste acid liquid required by treatment for the system.
As an improvement of the above technical solution; the waste acid regeneration and resource recovery system; the heat pump system is provided with a heat pump, a plate type heat exchange device, a condensation end water pump, a hot water tank, an evaporation end water pump, a preheating water tank, a cold water tank and a recovery device;
the heat pump is provided with a heat pump hot water input end, a heat pump hot water output end, a heat pump hot water input end and a heat pump hot water output end;
the condensation end water pump is provided with a condensation end water pump input end and a condensation end water pump output end and is used for providing power for water circulation of the condensation end of the heat pump system;
the hot water tank is provided with a hot water input end and a hot water output end and is used for storing hot water generated by the heat pump;
the evaporation end water pump is provided with a heat pump cold water input end and a heat pump cold water output end and is used for providing power for water circulation of the evaporation end of the heat pump system;
the preheating water tank is provided with a heat pump cold water input end and a heat pump cold water output end, is used for providing initial heat for the starting of a heat pump system and an air circulation system by utilizing electric heating, and can be closed after running;
the cooling water tank is provided with a cooling water input end, a cooling water output end, a cooling water input end and a cooling water output end and is used for providing cooling water for the condensation recovery system, and the cooling water absorbs heat through the condenser and then is stored in the cooling water tank and then is recovered through the evaporation end of the heat pump system;
as an improvement of the above technical solution; the waste acid regeneration and resource recovery system; the condensation recovery system is provided with a cold water tank, a condenser, a cooling water pump, an auxiliary heat dissipation unit and a recovery device;
the condenser is provided with an air input end, an air output end, a cooling water input end, a cooling water output end and a regenerated acid output end and is used for cooling hot air and re-condensing acid liquor;
the cooling water pump is provided with a cooling water input end and a cooling water output end and is used for providing power for cooling water circulation of the condensation recovery system;
the auxiliary heat dissipation water pump is provided with a cooling water input end and a cooling water output end and is used for providing power for water circulation of the auxiliary heat dissipation unit;
the auxiliary heat dissipation unit is provided with a cooling water input end and a cooling water output end and is used for assisting the cold water tank in heat dissipation, adjusting the temperature of the cold water tank in real time and maintaining the heat balance operation of an air circulation system, a heat pump system and a condensation recovery system;
the recovery device is a regenerated acid recovery device and is used for storing regenerated acid liquid.
As an improvement of the above technical solution; the waste acid regeneration and resource recovery system; the freezing and crystallizing system is provided with a freezing and stirring tank, a freezing unit, a filter tank and a recovery tank;
the freezing and stirring tank is provided with a concentrated waste acid liquid input end, a liquid-solid mixture output end, a refrigerating fluid input end and a refrigerating fluid output end and is used for freezing and concentrating the waste acid liquid to enable the waste acid liquid to reach saturation and separate out crystals;
the refrigerating unit is provided with a refrigerating fluid input end and a refrigerating fluid output end and is used for cooling the temperature of the stirring tank to below zero;
the filter tank is provided with a liquid-solid mixture input end, a recovered acid liquid output end and a crystal output end and is used for solid-liquid separation;
the recovery tank is provided with a recovered acid input end and is used for storing and recovering the acid liquor.
As an improvement of the above technical solution; the waste acid regeneration and resource recovery system; in the system, a loop formed by a heat pump hot water output end of a heat pump, a hot water input end of a plate type heat exchange device, a hot water output end of the plate type heat exchange device, a hot water input end of a hot water tank, a hot water output end of the hot water tank, a condensation end water pump input end of a condensation end water pump, a condensation end water pump output end of the condensation end water pump and a heat pump hot water input end of the heat pump is a heat pump condensation end;
a loop formed by a heat pump hot water output end of the heat pump, a cooling water input end of the cold water tank, a cooling water output end of the cold water tank, a heat pump cold water input end of the evaporation end water pump, a heat pump cold water output end of the evaporation end water pump and a heat pump hot water input end of the heat pump is a heat pump evaporation end;
wherein a cooling water loop is formed by a cooling water output end of the condenser, a cooling water input end of the cold water tank, a cooling water output end of the cold water tank, a cooling water input end of the cooling water pump, a cooling water output end of the cooling water pump and a cooling water input end of the condenser;
a cooling water auxiliary heat dissipation loop is formed by a cooling water output end of the cold water tank, a cooling water input end of the auxiliary heat dissipation water pump, a cooling water output end of the auxiliary heat dissipation water pump, a cooling water input end of the auxiliary heat dissipation unit, a cooling water output end of the auxiliary heat dissipation unit and a cooling water input end of the cold water tank;
wherein an air loop is formed by an air output end of the evaporator, an air input end of the condenser, an air output end of the condenser, an air input end of the fan, an air output end of the fan and an air input end of the evaporator;
the waste acid liquor loop is formed by a waste acid liquor output end of the evaporator, a waste acid liquor input end of the water pump, a waste acid liquor output end of the water pump, a waste acid liquor input end of the plate type heat exchange device, a waste acid liquor output end of the plate type heat exchange device and a waste acid liquor input end of the evaporator.
As an improvement of the above technical solution; the waste acid regeneration and resource recovery system; the corresponding realization process of the system is as follows; the waste acid liquid enters the evaporator and is then heated by the plate heat exchange device driven by the water pump, and heat is provided by the heat pump system; after the continuously circulated waste acid liquid is evaporated to obtain water and volatile acid, the water and the volatile acid are brought into a condenser of a condensation recovery system by air to re-condense new distilled water and pure acid liquid to finish the first recovery; the concentration of the waste acid solution continuously and circularly condensed is continuously increased until the waste acid solution reaches a saturated state, the waste acid solution enters a freezing stirring tank of a freezing crystallization system to start freezing crystallization, the waste acid solution reaches a supersaturated state, a solute is separated out and then enters a filter tank to carry out liquid-solid separation, a crystal is recovered, and a residual solution enters a recovery tank to recover to a normal temperature state to form an unsaturated solution again for reuse.
The invention has the following advantages: the invention relates to a constant-pressure low-temperature air circulation continuous waste acid regeneration and recovery system, which consists of an air circulation system, a heat pump system, a condensation recovery system and a freezing crystallization system; the water molecules and volatile acid in the low-temperature air separation waste acid liquid of the air circulation system are utilized, primary condensation recovery is carried out through the condensation recovery system, meanwhile, the waste heat of the condensation recovery system recovered by the heat pump system is continuously utilized to provide heat for the air circulation system, the concentrated acid liquid treated by the air circulation system is introduced into the freezing crystallization system for freezing crystallization and filtration, and the residual liquid is finally stored in the recovery tank for recycling. The system is suitable for treating waste acid solution with any concentration, and the waste acid treatment cost is greatly reduced due to the low manufacturing cost of equipment required by the normal-pressure low-temperature operation environment and the recycling operation of waste heat. The effect of regenerating acid is good.
(1) Compared with the traditional treatment mode, the system has the advantages of low treatment cost, no material consumption and no medicament, environmental protection and energy conservation, can reach the zero emission standard, and can reduce the treatment cost of waste acid and the use amount of fresh acid for enterprises. Compared with the traditional evaporation equipment, the system has low cost, small occupied area and sustainable operation. It is easier to implement for small plants.
(2) The system uses normal-temperature low-temperature evaporation, the evaporation efficiency of water and acid liquor in the waste water is improved through an evaporator 1 of an air circulation system, and the formed loop enables air heat energy to be recycled. The heat pump system absorbs the waste heat of the condensation recovery system and supplies heat for the air circulation system, so that the energy-saving effect is achieved.
(3) The system is in a normal-temperature and low-temperature state in operation, container pipelines are all made of plastic PP, the corrosion resistance is good, the manufacturing cost is low, most of the containers of the traditional evaporation equipment in the market are made of stainless steel at present, the corrosion resistance is achieved by lining fluoroplastic and graphite, the service life is short under the high-temperature and high-pressure environment, and the equipment manufacturing cost is high.
(4) The process of whole system treatment except the loss of equipment need not other consumptive material and addition medicament, only the electric energy loss. The recovered acid liquid can be directly used as new acid to be applied to industrial production.
(5) The waste acid solution passing through the evaporator enters the freezing and crystallizing system after reaching a saturated state to generate a great temperature difference, so that the waste acid solution reaches a supersaturated state, and the efficiency of solute precipitation is greatly improved.
(6) The whole equipment is made of PP materials, so that the chemical tolerance degree of a medium to be treated is greatly improved, and the influence of pH value is avoided; the equipment operation is normal pressure low temperature operation, and the equipment is concentrated by using an oxidizing and explosive medium; the waste acid, ferrous sulfate, chromium sulfate and other substances can be separated, and the waste is changed into valuable; the heat pump is adopted to supply heat to run without steam; the operation working condition is normal pressure and low temperature, and the manufacturing cost of the equipment is low.
Drawings
Fig. 1 is a block diagram of a system implementation corresponding to the present invention.
Wherein: the system comprises an evaporator 1, a fan 2, a water pump 3, a plate type heat exchange device 4 and a heat pump system, and relates to a heat pump 5, a condensation end water pump 6, a hot water tank 7, an evaporation end water pump 8, a preheating water tank 9, a cold water tank 10, a condenser 11, a cooling water pump 12, an auxiliary heat dissipation water pump 13, an auxiliary heat dissipation unit 14, a freezing stirring tank 15, a freezing unit 16, a filter tank 17, a recovery tank 18, a recovery device 19 and a supplement device 20.
Detailed Description
The present invention will be described in detail with reference to fig. 1, and the technical solutions in the embodiments of the present invention will be clearly and completely described, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention provides a waste acid regeneration and resource recovery system through improvement, which is characterized in that; the system comprises four parts, namely an air circulation system, a heat pump system, a condensation recovery system and a freezing crystallization system; the water molecules and volatile acid in the waste acid liquid are separated by utilizing the low-temperature air of the air circulation system, the condensation recovery system is used for carrying out primary condensation recovery, meanwhile, the heat pump system is used for recovering the waste heat of the condensation recovery system to continuously provide heat for the air circulation system, the concentrated acid liquid treated by the air circulation system is introduced into the freezing crystallization system for freezing crystallization and filtration, and the residual liquid is finally stored in the recovery tank for recycling.
In the system, the air circulation system relates to an evaporator 1, a fan 2, a water pump 3, a plate type heat exchange device 4 and a supplementing device 20;
in the system, the heat pump system relates to a heat pump 5, a plate type heat exchange device 4, a condensation end water pump 6, a hot water tank 7, an evaporation end water pump 8, a preheating water tank 9 and a cold water tank 10;
in the system, the condensation recovery system comprises a cold water tank 10, a condenser 11, a cooling water pump 12, an auxiliary heat dissipation water pump 13, an auxiliary heat dissipation unit 14 and a recovery device 19;
in the system, the freezing and crystallizing system comprises a freezing stirring tank 15, a freezing unit 16, a filter tank 17 and a recovery tank 18.
When the system is implemented, as shown in FIG. 1; the air circulation system relates to an evaporator 1, a fan 2, a water pump 3, a plate type heat exchange device 4 and a supplementing device 20;
the evaporator 1 is provided with a supplementary waste acid liquid inlet 1k, an air input end 1a, an air output end 1b, a waste acid liquid input end 1g, a waste acid liquid output end 1h and a concentrated waste acid liquid output end 4a, and the evaporator 1 is used for heating air to evaporate and separate water molecules and volatile acid liquid in waste acid.
The fan 2 is provided with an air input end 1e and an air output end 1f, and the fan 2 is used for providing power for air circulation.
The water pump 3 is provided with a waste acid liquid input end 1i and a waste acid liquid output end 1j, and the water pump 3 is used for providing power for waste acid liquid circulation.
The plate type heat exchange device 4 is provided with a waste acid liquid input end 1l, a waste acid liquid output end 1m, a hot water input end 2a and a hot water output end 2b, and the plate type heat exchange device 4 is used for heating the waste acid liquid.
The supplementing device 20 is an external device and is used for providing the system with the waste acid liquid required by treatment.
When the system is implemented, as shown in FIG. 1; the heat pump system relates to a heat pump 5, a plate type heat exchange device 4, a condensation end water pump 6, a hot water tank 7, an evaporation end water pump 8, a preheating water tank 9, a cold water tank 10 and a recovery device 19.
The heat pump 5 is provided with a heat pump hot water input end 2e, a heat pump hot water output end 2f, a heat pump hot water input end 2h and a heat pump hot water output end 2 g;
the condensation end water pump 6 is provided with a condensation end water pump input end 2m and a condensation end water pump output end 2n, and the condensation end water pump 6 is used for providing power for water circulation of the condensation end of the heat pump system;
the hot water tank 7 is provided with a hot water input end 2c and a hot water output end 2d, and the hot water tank 7 is used for storing hot water generated by the heat pump;
the evaporation end water pump 8 is provided with a heat pump cold water input end 2o and a heat pump cold water output end 2p and is used for providing power for water circulation of the evaporation end of the heat pump system;
the preheating water tank 9 is provided with a heat pump cold water input end 2i and a heat pump cold water output end 2j, is used for providing initial heat for the starting of a heat pump system and an air circulation system by utilizing electric heating, and can be closed after running;
the cold water tank 10 is provided with a cooling water input end 3c, a cooling water output end 3d, a cooling water input end 3e, a cooling water output end 3f, a cooling water input end 2k and a cooling water output end 2l and is used for providing cooling water for the condensation recovery system, and the cooling water absorbs heat through the condenser 11 and then is stored in the cold water tank 10 and then is recovered through the evaporation end of the heat pump system;
when the system is implemented, as shown in FIG. 1; the condensation recovery system comprises a cold water tank 10, a condenser 11, a cooling water pump 12, an auxiliary heat dissipation water pump 13, an auxiliary heat dissipation unit 14 and a recovery device 19;
the condenser 11 is provided with an air input end 1c, an air output end 1d, a cooling water input end 3a, a cooling water output end 3b and a regenerated acid output end 3q and is used for cooling hot air and re-condensing acid liquor.
The cooling water pump 12 is provided with a cooling water input end 3m and a cooling water output end 3n and is used for providing power for cooling water circulation of the condensation recovery system.
The auxiliary heat dissipation water pump 13 is provided with a cooling water input end 3o and a cooling water output end 3p and is used for providing power for water circulation of the auxiliary heat dissipation unit 14.
The auxiliary heat dissipation unit 14 has a cooling water input end 3h and a cooling water output end 3g, and is used for assisting the cooling water tank in heat dissipation, adjusting the temperature of the cooling water tank 10 in real time, and maintaining the heat balance operation of the air circulation system, the heat pump system and the condensation recovery system.
The recovery device 19 is a regenerated acid recovery device and is used for storing regenerated acid liquid.
When the system is implemented, as shown in FIG. 1; the freezing and crystallizing system comprises a freezing and stirring tank 15, a freezing unit 16, a filter tank 17 and a recovery tank 18;
the freezing and stirring tank 15 is provided with a concentrated waste acid liquid input end 4b, a liquid-solid mixture output end 4c, a refrigerating fluid input end 4j and a refrigerating fluid output end 4h, and is used for freezing and concentrating the waste acid liquid to enable the waste acid liquid to reach saturation and separate out crystals.
The refrigerating unit 16 is provided with a refrigerating fluid input end 4i and a refrigerating fluid output end 4g and is used for cooling the temperature of the stirring tank 15 to below zero.
The filtering tank 17 is provided with a liquid-solid mixture input end 4d, a recovered acid liquid output end 4e and a crystal output end 4k and is used for solid-liquid separation.
The recovery tank 18 has a recovered acid input 4f for storing the recovered acid solution.
When the system is implemented, as shown in FIG. 1; in the system, a loop formed by a heat pump hot water output end 2f of a heat pump 5, a hot water input end 2a of a plate type heat exchange device 4, a hot water output end 2b of a hot water tank 7, a hot water output end 2c of the hot water tank 7, a condensation end water pump input end 2m of a condensation end water pump 6, a condensation end water pump output end 2n of the condensation end water pump 6 and a heat pump hot water input end 2e of the heat pump 5 is a heat pump condensation end.
The loop formed by the hot water output end 2g of the heat pump 5, the cooling water input end 2k of the cold water tank 10, the cooling water output end 2l of the cold water tank 10, the hot water input end 2o of the evaporation end water pump 8, the hot water output end 2p of the evaporation end water pump 8 and the hot water input end 2h of the heat pump 5 is the evaporation end of the heat pump.
Wherein a cooling water loop is formed by a cooling water output end 3b of the condenser 11, a cooling water input end 3c of the cold water tank 10, a cooling water output end 3d of the cold water tank 10, a cooling water input end 3m of the cooling water pump 12, a cooling water output end 3n of the cooling water pump 12 and a cooling water input end 3a of the condenser 11.
The cooling water auxiliary heat dissipation loop is formed by a cooling water output end 3f of the cold water tank 10, a cooling water input end 3o of the auxiliary heat dissipation water pump 13, a cooling water output end 3p of the auxiliary heat dissipation water pump 13, a cooling water input end 3h of the auxiliary heat dissipation unit 14, a cooling water output end 3g of the auxiliary heat dissipation unit 14 and a cooling water input end 3e of the cold water tank 10.
An air loop is formed by the air output end 1b of the evaporator 1, the air input end 1c of the condenser 11, the air output end 1d of the condenser 11, the air input end 1e of the fan 2, the air output end 1f of the fan 2 and the air input end 1a of the evaporator 1.
A waste acid liquid loop is formed by a waste acid liquid output end 1h of the evaporator 1, a waste acid liquid input end 1i of the water pump 3, a waste acid liquid output end 1j of the water pump 3, a waste acid liquid input end 1l of the plate type heat exchange device 4, a waste acid liquid output end 1m of the plate type heat exchange device 4 and a waste acid liquid input end 1g of the evaporator 1.
As shown in fig. 1; the corresponding realization process of the system is as follows; the waste acid liquid enters the evaporator 1 and then is heated by the plate heat exchange device 4 brought by the water pump 3, and heat is provided by the heat pump system; the continuously circulated waste acid liquid is evaporated to obtain water and volatile acid, and then the water and volatile acid are brought into a condenser 11 of a condensation recovery system by air to re-condense to obtain new distilled water and pure acid liquid to finish the first recovery; the concentration of the waste acid solution which is continuously circulated and condensed is continuously increased until the waste acid solution reaches a saturated state, the waste acid solution enters a freezing stirring tank 15 of a freezing crystallization system to start freezing crystallization, the waste acid solution reaches a supersaturated state, a solute is separated out and then enters a filter tank 17 to carry out liquid-solid separation, a crystal is recovered, and a residual solution enters a recovery tank 18 to recover to a normal temperature state to form an unsaturated solution again for reuse.
The system has the following advantages:
(1) compared with the traditional treatment mode, the system has the advantages of low treatment cost, no material consumption and no medicament, environmental protection and energy conservation, can reach the zero emission standard, and can reduce the treatment cost of waste acid and the use amount of fresh acid for enterprises. Compared with the traditional evaporation equipment, the system has low cost, small occupied area and sustainable operation. It is easier to implement for small plants.
(2) The system uses normal-temperature low-temperature evaporation, the evaporation efficiency of water and acid liquor in the waste water is improved through an evaporator 1 of an air circulation system, and the formed loop enables air heat energy to be recycled. The heat pump system absorbs the waste heat of the condensation recovery system and supplies heat for the air circulation system, so that the energy-saving effect is achieved.
(3) The system is in a normal-temperature and low-temperature state in operation, container pipelines are all made of plastic PP, the corrosion resistance is good, the manufacturing cost is low, most of the containers of the traditional evaporation equipment in the market are made of stainless steel at present, the corrosion resistance is achieved by lining fluoroplastic and graphite, the service life is short under the high-temperature and high-pressure environment, and the equipment manufacturing cost is high.
(4) The process of whole system treatment except the loss of equipment need not other consumptive material and addition medicament, only the electric energy loss. The recovered acid liquid can be directly used as new acid to be applied to industrial production.
(5) The waste acid solution passing through the evaporator 1 enters the freezing and crystallizing system to generate a great temperature difference after reaching a saturated state, so that the waste acid solution reaches a supersaturated state, and the efficiency of solute precipitation is greatly improved.
(6) The whole equipment is made of PP materials, so that the chemical tolerance degree of a medium to be treated is greatly improved, and the influence of pH value is avoided; the equipment operation is normal pressure low temperature operation, and the equipment is concentrated by using an oxidizing and explosive medium; the waste acid, ferrous sulfate, chromium sulfate and other substances can be separated, and the waste is changed into valuable; the heat pump is adopted to supply heat to run without steam; the operation working condition is normal pressure and low temperature, and the manufacturing cost of the equipment is low.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (7)
1. A waste acid regeneration and resource recovery system is characterized in that; the system comprises four parts, namely an air circulation system, a heat pump system, a condensation recovery system and a freezing crystallization system; the water molecules and volatile acid in the waste acid liquid are separated by utilizing the low-temperature air of the air circulation system, the condensation recovery system is used for carrying out primary condensation recovery, meanwhile, the heat pump system is used for recovering the waste heat of the condensation recovery system to continuously provide heat for the air circulation system, the concentrated acid liquid treated by the air circulation system is introduced into the freezing crystallization system for freezing crystallization and filtration, and the residual liquid is finally stored in the recovery tank for recycling.
2. A spent acid regeneration and resource recovery system according to claim 1, wherein; the air circulation system relates to an evaporator (1), a fan (2), a water pump (3), a plate type heat exchange device (4) and a supplementing device (20);
the evaporator (1) is provided with a supplementary waste acid liquid inlet (1 k), an air input end (1 a), an air output end (1 b), a waste acid liquid input end (1 g), a waste acid liquid output end (1 h) and a concentrated waste acid liquid output end (4 a), and the evaporator (1) is used for heating air to evaporate and separate water molecules and volatile acid liquid in waste acid;
the fan (2) is provided with an air input end (1 e) and an air output end (1 f), and the fan (2) is used for providing power for air circulation;
the water pump (3) is provided with a waste acid liquid input end (1 i) and a waste acid liquid output end (1 j), and the water pump (3) is used for providing power for waste acid liquid circulation;
the plate type heat exchange device (4) is provided with a waste acid liquid input end (1 l), a waste acid liquid output end (1 m), a hot water input end (2 a) and a hot water output end (2 b), and the plate type heat exchange device (4) is used for heating the waste acid liquid;
the supplementing device (20) is an external device and is used for providing the waste acid liquid required by treatment for the system.
3. A spent acid regeneration and resource recovery system according to claim 1, wherein; the heat pump system is provided with a heat pump (5), a plate type heat exchange device (4), a condensation end water pump (6), a hot water tank (7), an evaporation end water pump (8), a preheating water tank (9), a cold water tank (10) and a recovery device (19);
the heat pump (5) is provided with a heat pump hot water input end (2 e), a heat pump hot water output end (2 f), a heat pump hot water input end (2 h) and a heat pump hot water output end (2 g);
the condensation end water pump (6) is provided with a condensation end water pump input end (2 m) and a condensation end water pump output end (2 n), and the condensation end water pump (6) is used for providing power for water circulation of the condensation end of the heat pump system;
the hot water tank (7) is provided with a hot water input end (2 c) and a hot water output end (2 d), and the hot water tank (7) is used for storing hot water generated by the heat pump;
the evaporation end water pump (8) is provided with a heat pump cold water input end (2 o) and a heat pump cold water output end (2 p) and is used for providing power for water circulation of the evaporation end of the heat pump system;
the preheating water tank (9) is provided with a heat pump cold water input end (2 i) and a heat pump cold water output end (2 j), is used for providing initial heat for the heat pump system and the air circulation system by utilizing electric heating, and can be closed after running;
the cold water tank (10) is provided with a cooling water input end (3 c), a cooling water output end (3 d), a cooling water input end (3 e), a cooling water output end (3 f), a cooling water input end (2 k) and a cooling water output end (2 l) and is used for providing cooling water for the condensation recovery system, and the cooling water is stored in the cold water tank (10) after absorbing heat through the condenser (11) and then is recovered through the evaporation end of the heat pump system.
4. A spent acid regeneration and resource recovery system according to claim 1, wherein; the condensation recovery system is provided with a cold water tank (10), a condenser (11), a cooling water pump (12), an auxiliary heat dissipation water pump (13), an auxiliary heat dissipation unit (14) and a recovery device (19);
the condenser (11) is provided with an air input end (1 c), an air output end (1 d), a cooling water input end (3 a), a cooling water output end (3 b) and a regenerated acid output end (3 q) and is used for cooling hot air and re-condensing acid liquor;
the cooling water pump (12) is provided with a cooling water input end (3 m) and a cooling water output end (3 n) and is used for providing power for cooling water circulation of the condensation recovery system;
the auxiliary heat dissipation water pump (13) is provided with a cooling water input end (3 o) and a cooling water output end (3 p) and is used for providing power for water circulation of the auxiliary heat dissipation unit (14);
the auxiliary heat dissipation unit (14) is provided with a cooling water input end (3 h) and a cooling water output end (3 g) and is used for assisting the cold water tank in heat dissipation, adjusting the temperature of the cold water tank (10) in real time and maintaining the heat balance operation of an air circulation system, a heat pump system and a condensation recovery system;
the recovery device (19) is a regenerated acid recovery device and is used for storing regenerated acid liquid.
5. A spent acid regeneration and resource recovery system according to claim 1, wherein; the freezing and crystallizing system is provided with a freezing and stirring tank (15), a freezing unit (16), a filtering tank (17) and a recovery tank (18);
the freezing and stirring tank (15) is provided with a concentrated waste acid liquid input end (4 b), a liquid-solid mixture output end (4 c), a refrigerating fluid input end (4 j) and a refrigerating fluid output end (4 h), and is used for freezing and concentrating the waste acid liquid to enable the waste acid liquid to reach saturation and separate out crystals;
the refrigerating unit (16) is provided with a refrigerating fluid input end (4 i) and a refrigerating fluid output end (4 g) and is used for reducing the temperature of the refrigerating stirring tank (15) to be below zero;
the filter tank (17) is provided with a liquid-solid mixture input end (4 d), a recovered acid liquid output end (4 e),
A crystal output end (4 k) for solid-liquid separation;
the recovery tank (18) is provided with a recovered acid input end (4 f) and is used for storing recovered acid liquid.
6. A spent acid regeneration and resource recovery system according to claim 1, wherein; in the system, a loop consisting of a hot water output end (2 f) of a heat pump (5), a hot water input end (2 a) of a plate-type heat exchange device (4), a hot water output end (2 b) of a hot water tank (4), a hot water input end (2 c) of a hot water tank (7), a hot water output end (2 d) of a condensation end water pump (6), a condensation end water pump input end (2 m), a condensation end water pump output end (2 n) of the condensation end water pump (6) and a hot water input end (2 e) of the heat pump (5) is a heat pump condensation end;
a loop formed by a heat pump hot water output end (2 g) of the heat pump (5), a cooling water input end (2 k) of the cold water tank (10), a cooling water output end (2 l) of the cold water tank (10), a heat pump cold water input end (2 o) of the evaporation end water pump (8), a heat pump cold water output end (2 p) of the evaporation end water pump (8) and a heat pump hot water input end (2 h) of the heat pump (5) is a heat pump evaporation end;
wherein a cooling water loop is formed by a cooling water output end (3 b) of the condenser (11), a cooling water input end (3 c) of the cold water tank (10), a cooling water output end (3 d) of the cold water tank (10), a cooling water input end (3 m) of the cooling water pump (12), a cooling water output end (3 n) of the cooling water pump (12) and a cooling water input end (3 a) of the condenser (11);
a cooling water auxiliary heat dissipation loop is formed by a cooling water output end (3 f) of the cold water tank (10), a cooling water input end (3 o) of the auxiliary heat dissipation water pump (13), a cooling water output end (3 p) of the auxiliary heat dissipation water pump (13), a cooling water input end (3 h) of the auxiliary heat dissipation unit (14), a cooling water output end (3 g) of the auxiliary heat dissipation unit (14) and a cooling water input end (3 e) of the cold water tank (10);
wherein an air loop is formed by an air output end (1 b) of the evaporator (1), an air input end (1 c) of the condenser (11), an air output end (1 d) of the condenser (11), an air input end (1 e) of the fan (2), an air output end (1 f) of the fan (2) and an air input end (1 a) of the evaporator (1);
from a waste acid liquid output end (1 h) of an evaporator (1), a waste acid liquid input end (1 i) of a water pump (3), a waste acid liquid output end (1 j) of the water pump (3), a waste acid liquid input end (1 l) of a plate type heat exchange device (4), a waste acid liquid output end (1 m) of the plate type heat exchange device (4) to a waste acid liquid input end (1 g) of the evaporator (1)
Forming a waste acid liquor loop.
7. A spent acid regeneration and resource recovery system according to claim 1, wherein; the corresponding realization process of the system is as follows; the waste acid liquid enters the evaporator (1) and is then brought into the plate type heat exchange device (4) by the water pump (3) for heating, and heat is provided by the heat pump system; the waste acid liquid which is continuously circulated is evaporated to separate water and is easy to be mixed
After the acid is volatilized, the air carries the acid into a condenser (11) of a condensation recovery system to be condensed again to obtain new distilled water and pure acid liquor to finish the first recovery; the concentration of the waste acid solution which is continuously circulated and condensed is continuously increased until the waste acid solution reaches a saturated state, the waste acid solution enters a freezing stirring tank (15) of a freezing crystallization system to start freezing crystallization, at the moment, the waste acid solution reaches a supersaturated state, a solute is separated out and then enters a filter tank (17) to carry out liquid-solid separation, a crystal is recovered, and a residual solution enters a recovery tank (18) to recover to a normal temperature state to form an unsaturated solution again for reuse.
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